Blazor "Onboarding" Sample

[hugh-maaskant]

FYI: I created an extension to the BFF for Blazor Auto Rendering sample that adds the following two capabilities:

1. Replace the OpenID Connect Provider (IDP) sub claim value with the application's internal user identity upon sign-in.
2. A new-user "onboarding" login flow, including persisting new user attributes to the application database.

After the user has been signed in by the IDP (using a temporary cookie), it intercepts the login flow using the OIDC handler's event callbacks. It then checks if this is a new user, and if so shows the onboarding Blazor page with a form to be filled out. If the user is known, and also after the onboarding form submission, the user gets signed in to a new cookie, the Application cookie. This allows adding, changing, or removing any Claims from the IDP with Claims for the Application, including the value of the user Id if desired.

To help me remember what I did three month from now, I have extensively commented the code. Next to the README.md, there is a design document going into some detail about the issues encountered and the choices made.

You can find the code on GitHub; furthermore it is referenced from the Duende samples documentation. Just like the Duende samples, it is MIT licensed.

Comments are welcome :-).

Hugh Maaskant

[maartenba]

Thanks Hugh! We've linked to your sample in the docs now at https://docs.duendesoftware.com/bff/samples/#new-user-onboarding-with-blazor-auto-rendering